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The 1967 attempt of structural analysis of the solid-state complex of caffeine and pyrogallol was a pioneering structural investigation in the supramolecular chemistry of caffeine, of what today would easily be considered an archetype of a model pharmaceutical cocrystal. Re-investigating this historically important system demonstrates that this long overlooked complex is most likely a tetrahydrate with a different structure and composition than initially proposed, and provides the crystal structure of the anhydrous cocrystal. [ABSTRACT FROM AUTHOR]

N-Alkylation of a novel pyridine sensor results in pyridinium salts whose conformations are stabilised by pyridinium cation–π interactions resulting in a fluorescent response that can be used to sense the presence of alkylating agents in solution at low concentration. [ABSTRACT FROM AUTHOR]